Current collector for electric railways



Nov.ll, 1930. J F DE Toy/mos 1,781,323

GURRENT COLLECTOR FOR ELECTRIC RAILWAYS- Original Filed Jan. 21, 1930 (71,1124: Z'sairr Ze EEG/@571:

' latcntecl Nov. 11, 1930 PATENT QFFICE J ULIUS FISCHER DE TOVAROS, F BUDAPEST, HUNGARY CURRENT COLLECTOR ELECTRIC RAILWAYS Original application filed July 17, 1925, Serial No. 44,298, new Patent No. 1,744,622, dated January 21, 1930, and in Hungary July 23, 1924. Divided and this application filed October 29, 1929. Serial No.

The present invention relates to a current collector for electric railways comprising a sliding shoe having aflat wide contact surface and swingably or pivotally carried on a frame adjusted at an acute angle to the trolley wire in order to ensure a complete contact on said wire along the whole width of the contact surface. The frame is fitted in known manner on a frame arranged on the vehicle top, preferably on a swinging scissor current collector frame, and can be reversed on changing the direction of travel.

For sliding plates or shoes of such current collectors counterweights or springs are provided which prevent a tilting of the sliding shoe, that is, which tend to bring back the contact surface of the shoe continuously into the horizontal position. 7

Hitherto, the counter-balancing weights or return springs were arranged at the upper end of the inclined swinging frame carrying the sliding shoe, so that they acted directly on the shoe. This arrangement, however, on the one hand increases the weight, that is, the inertia of the sliding shoe so that this cannot follow sufliciently quickly the small deviations of the trolley wire from the horizontal during the journey, and on the other hand the kinetic energy of the masses of the return or counterbalancing weights acts on the deflection of the swinging inclined frame all the stronger the closer the centre of gravity of this weight approaches the upper end of the swinging frame. In addition the re turn weight arranged at thetop causes, particularly with high speeds, a somewhat considerable air resistance.

The invention is a division of my prior application Serial No. 44,298, filed July 17, 1925, now Patent No. 1,744,622, granted January 21, 1930, and it has for its object to transfer the return springs or weights to the vicinity of the lower link of the swinging frame and thus overcome the above mentioned defects.

are formed by the shoe and the frame, while the other two adjacent sides are formed by a tension or. compression member and a controlling lever for the shoe to which the return spring or the return weight is connected.

On the drawing two ways of carrying out the invention are illustrated.

Figures 1 and 2 show one form of construction in side view, in the two travelling directions.

Figure 3 shows the second form of construction in one travelling direction.

Figure 4 is an explanatory sketch ofthe link parallelogram of the second form of construction.

In Figures 1 and 2, 7c, and 70 are the rods forming the top link of a scissor current collector frame to which is hinged the inclined swinging frame 76. This latter carries the shoe a which is swingably carried at the upper end ofthe frame 70 about the axis 0 by means of the bearings a, so that the fiat wide cont-act surfaces of the shoe a may lie closely to thetrolley wire 1) in any angular position of the frame 70.

The frame is has an extension 76 to which are connected the springs r 0 The frame 70 can be reversed from the position shown in Figure 1 to the position corresponding to the other direction of travel, the adjusted position being ensured by one or the other of the springs 73 or is.

.The link parallelogram according to the invention is formed in such manner that the shoe a is hinged at a point 0 lying outside its axis of oscillation 0, by means of a tension or compressionmember, for example the rod 70 with a control lever in, at 0 which lever is rotatably carried in the vicinity of the top link or, according to the drawing, on the top link 0 itself. The stud of the link 0 is fitted on a small carrier 8 which is connected with the shoe for example by means of rivet (Z sunk in itslubricating groove. 1

The control lever 70 is rigidly connected with an arm 76, at the lower end of which are connected the return springs 1 ,72 which may also be replacedby a weight.

VVit-h oscillations of the frame 70 the link apparatus 10 75 0 ,76 0 holds the contact surface a continuously in approximately Vin vertical plane and the use :of an inclined re versible frame is on a current collecting frame WltllOLlt-TSQLHI'IIlg upper return weights or sprlngs. r

The form of construction according to Figure 8 only diifers from the first construction by the length of the control arm being 1 larger than the rotating arm 0, 0 of the tension or compression member 70 acting on the shoe and connecting the latter with the control arm Z0 This formof construction is for the following purpose c In cases where the inclined resultant indicated by'R in Figure 3, of the pressure 'and'the friction on the trolley Wire does not pass on changing the direction of travel, character ized by a link parallelogram provided on one side of the frame or sliding loop capable of oscillation, two adjacent sides of which are formedjby the' shoe and the frame, and the ling lever for the shoe, on which engages the 2. TCllllGDt collector according to claim 1', cliarae'teriie'd by 'the'length of the arm of the control lever forming thelowerzhorizontallink o the pa ia sleg am beinssfe rtl the part of the sliding shoe which forms the upper horizontal link of the parallelogram.

In testimon signature. r g p .7

JULIUS FISCHER n12; TOVARQS y whereof h'ereuntoiaffiximy ll through th'e'rotating axis of the sliding shoe,

a turning moment about the axis of rotation 0 of't'he shoe is exerted by this resultant tend i 7 ing' to depress the back half, in the direction of travel, ofthe shoe and thus to-raise thejfront half; Consequently the pressure along the width of the contact surface is unequah-being greater at the front part, which causes a prer'natu're wear of the latter. I y 7 If now the arm 70 is lengthened so that a.

parallelogram with unequal sides is produced and the point 0 is caused-to lie at 0'3 (Figure t) then with t'hesa'me length of the tension or compression member 70 and exactly for the reason ofyits length remaining thesame,an

upward; directed pressure is exerted on the back half, .in the direction of travel, of the sliding-shoe, which tends to-transfer the point In this manner, a'co'unter turning moment 7 is created compensating the resultant R of the pressure and the fr'iction on the trolley wire,

"thusproducing during travelling anequal pressure" over the whole width of the "sliding 1 shoe; In the "reversed position of the frame lc, V a counter turning moment is obtained for the same reasons, which tends to 'draw 'the front edge,.in' thedirection of travel, of theshoe downwarddthat is, to take it away from the trolley wire. This has'the same'effect as the beforementioned upward pressure of the back edgeof the shoe.

" Whatl claim is": 1 A currentcollector for electric railways embodyinga sliding shoe provided wanna wide contact" surfaces and mounted to oscil-- late on a'frame adjusted at an acute angle to 'thetrolleywire, {which frame can be reyersed,

other adjacent sides of'which are formed by a 7 tension orcompression member and a control- 

